Copy tempest.common.tempest_fixtures in to Neutron

tempest_fixtures is used exclusively in Tempest and Neutron,
therefor I don't think it makes sense to move it in to tempest.lib.
I'd rather copy it in to the Neutron repo.

Change-Id: Ibb52e2cae3f1af1569a04123c43ebc4d125e326d
Related-bug: #1555356
diff --git a/neutron/tests/tempest/common/tempest_fixtures.py b/neutron/tests/tempest/common/tempest_fixtures.py
new file mode 100644
index 0000000..d416857
--- /dev/null
+++ b/neutron/tests/tempest/common/tempest_fixtures.py
@@ -0,0 +1,21 @@
+# Copyright 2013 IBM Corp.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from oslo_concurrency.fixture import lockutils
+
+
+class LockFixture(lockutils.LockFixture):
+    def __init__(self, name):
+        super(LockFixture, self).__init__(name, 'tempest-')